I am 87 years old, female and childless and Singapore citizen. would like to emigrate to guangzhou.

I was a second wife of my late husband and followed him to Singapore and lived here for almost 50 years. With the passing of my husband, I lived alone without dependants. I am in contact with my late husband's family and his children and grandchildren. They urged me to emigrate back to Guangzhou since I am alone in Singapore . After much thought, I decided to go back for good. I am a citizen of Singapore, now seeking permission to emigrate to Guangzhou. My family in Guangzhou welcome me and will finance my living expenses in Guangzhou. What must I do? I am making a trip to Guangzhou in Mar 16 for 3 months. I would like to do the necessary documentation there if possible.
Hope to hear from you on the guidelines.